Gyroseris
Reuss, 1854
Type Species
Gyroseris patellaris Reuss, 1854: 126.; Original Designation Reuss, 1854: 126.
Type Specimen: Syntype; ; Verified; Unknown
Type Locality: Upper Santonian of Austria (Neffgraben, Gosau Group).
The syntypes of the type species are housed at NHMW (Vienna) under 1864/0040/1431.
Synonyms
Diagnosis
Solitary, patellate. Septa compact, distinctly granulated laterally, arranged radially in unequal systems. Columella papillose, well-developed. No synapticulae. Endothecal dissepiments thick, vesicular. Wall parathecal-epicostal.
Remarks
Wells (1956, p. F381) stated that Gyroseris was a junior synonym of the genus Trochoseris Milne Edwards and Haime, 1849a. However, fundamental differences can be seen in the development of both the septa and the wall. In Trochoseris synapticulae are abundant, forming a synapticulothecal wall and the septa are subcompact to porous (septa are compact and synapticulae absent in Gyroseris)
Distribution
- Southern Europe; Late Cretaceous
- Central Europe; Late Cretaceous
This page has been in preparation since 02-Jun-2007 12:36
This version was contributed by Rosemarie Baron-Szabo on 25-Aug-2010 18:19.
Page authors are: Rosemarie Baron-Szabo. Please contact the editor if you would like to contribute to the diagnosis of this taxon.
The editor is: Rosemarie Baron-Szabo
|